CVE-2017-9763 — The grub_ext2_read_block function in fs/ext2
The grub_ext2_read_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote attackers to cause a denial of service (excessive stack use and application crash) via a crafted binary file, related to use of a variable-
Published
2017-06-19T16:29:00.797
Last modified
2026-05-13T00:24:29.033
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
01What is this vulnerability?
The grub_ext2_read_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote attackers to cause a denial of service (excessive stack use and application crash) via a crafted binary file, related to use of a variable-size stack array.
02Affected products
No structured affected-product list available — see references below for vendor advisories.
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2017-06-19T16:29:00.797
- Last modified: 2026-05-13T00:24:29.033
09References
- git.savannah.gnu.org — http://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=ac8cac1d…
- www.securityfocus.com — http://www.securityfocus.com/bid/99141
- github.com — https://github.com/radare/radare2/commit/65000a7fd9eea62359e6d6714f17b94a99a82ed…
- github.com — https://github.com/radare/radare2/issues/7723
- git.savannah.gnu.org — http://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=ac8cac1d…
- www.securityfocus.com — http://www.securityfocus.com/bid/99141
- github.com — https://github.com/radare/radare2/commit/65000a7fd9eea62359e6d6714f17b94a99a82ed…
- github.com — https://github.com/radare/radare2/issues/7723
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